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Pension Benefits - Assumptions (Details)
Dec. 31, 2020
Dec. 31, 2019
Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.57% 4.85%
Rate of increase in compensation level 5.00% 5.00%
Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 8.06% 10.42%
Rate of increase in compensation level 7.00% 7.00%